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【UNDER-VOLTAGE REGULATOR】 This Battery Low Voltage Regulator is a under-voltage switch controller, which is used to turn off the power of load in the event of the voltage dropping below a set value. 【LED INDICATOR DESIGNED】The Battery Low Voltage Controller is designed with a LED indicator to show if battery is under-voltage. 【ADJUSTABLE VOLTAGE VALUE】This Automatic Switch has a equipped with buttons, and you can simply press the buttons to adjust both turn-off and turn-on voltage value. 【AUTOMATICALLY CONTROLLED】The Low Voltage Control Module will automatically turn on load again, when the battery voltage increases to a set value. 【OVER-DISCHARGING PROTECTION】This Low Voltage Controller will help you to protect battery from over-discharging and prolong battery life.